Debt collection — National Credit Systems,Inc. (PA)

Debt is not yours. I lived at via XXXX from XX/XX/XXXX to XX/XX/XXXX. After I moved out they sent me to a debt collector for {$8200.00}. I called the apartment complex and asked what I was charged for and they wouldnt tell me. I never received anything in the mail from via XXXX saying I owed money. I have since sent numerous emails asking for validation of this debt to prove that I owe it. All that they are able to provide is my lease agreement with the apartment complex and a bill. I have asked for validation of the alleged damages that were caused, like pictures, bills to fix the apartment etc. I have not received such information. I have asked for the debt collector to stop reporting to my credit until I receive validation which they have not done.